[Bug 1930478] Re: upgrade 18.04 to 20.04; 3rd party packages

[Chris Guiver]

I removed telegram, skype, virtualbox, cool-retro-term packages &
commented out sources  (& apt autoremove);

I didn't expect issues with costales/anoise, and chose to ignore
google/chrome or opera/stable

Again tried to release-upgrade; again 3rd party packages error.

I then removed ubuntu-mate-core & ubuntu-mate-desktop, and noted what
was removed...  added back redshift-gtk & wallpaper packages; apt
autoremove

Now the release-upgrade is downloading/installing...

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https://bugs.launchpad.net/bugs/1930478

Title:
  upgrade 18.04 to 20.04; 3rd party packages

Status in ubuntu-release-upgrader package in Ubuntu:
  Incomplete

Bug description:
  Error report uploaded primarily so I can peruse & hopefully learn from
  it.

  My primary box; dual-boot/alternate 18.04 system.... 
  Cause for sure will be 3rd party as reported...
  (I have no idea what's on it; haven't used this install since the early cosmic cycle)

  This was likely caused by: 
  * Unofficial software packages not provided by Ubuntu 
  Please use the tool 'ppa-purge' from the ppa-purge 
  package to remove software from a Launchpad PPA and 
  try the upgrade again. 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If 
  you want to investigate this yourself the log files in 
  '/var/log/dist-upgrade' will contain details about the upgrade. 
  Specifically, look at 'main.log' and 'apt.log'.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.44
  ProcVersionSignature: Ubuntu 4.15.0-143.147-generic 4.15.18
  Uname: Linux 4.15.0-143-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.24
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: LXDE
  Date: Wed Jun  2 09:28:40 2021
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2018-07-06 (1061 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-06-01 (0 days ago)

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